Filter slot cover Air Filter Accessories at

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metal furnace filter slot cover Filter Lock installs in seconds without any tools The built-in magnets attach Filter Lock to metal duct work and hold it securely in place Use Filter Lock  The FilterLock seals furnace and air conditioning air filter slots to reduce utility bills and improve indoor air quality The Filter Slot Cover eliminates  I think I'll make a similar cover for my furnace filter slot I see the potential for better return air flow upstairs by restricting leakage

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